I used 0.0787" diameter titanium wire to add a bail to a Snow Peak Ti bowl. Despite tough rep of titanium, I didn't have any trouble drilling the holes. Set things up so that when I fold the bail down, it's more or less flush with the outside of the bowl. I'm sure there are other ways to do it, some of which may be better, but I've been happy with this. The one thing that's tricky is balance. If you don't position your holes precisely enough, or if the bail is otherwise throwing off the symmetry, the bowl is going to tip when you try to hold it by the bail. If I were doing this again, and using light, flexible wire, I'd be tempted to do it with three evenly spaced connections to the bowl rather than a standard, continuous bail - it'd be much more stable.